What's the matter with the low voltage in the control circuit of Ma6 automobile intake manifold channel?

Hello, this fault should be that there are two vacuum solenoid valves at the back end of the cylinder head, and one of them is broken. This solenoid valve is particularly easy to break down. I suggest you go to the repair shop to have a check. If there is no problem with the wiring, the solenoid valve needs to be replaced. If this solenoid valve is broken, the engine power will be reduced. I have fixed this problem many times. I hope my answer is helpful to you. Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.